They also use Empythoned (CPython compiled with Emscripten, https://github.com/replit/empythoned https://github.com/replit/empythoned) and Emscripted-Ruby (Ruby

They also use Empythoned (CPython compiled with Emscripten, https://github.com/replit/empythoned https://github.com/replit/empythoned) and Emscripted-Ruby (Ruby compiled with Emscripten, https://github.com/replit/emscripted-ruby https://github.com/replit/emscripted-ruby) and a version of Lua compiled with Emscripted (https://github.com/replit/jsrepl/tree/master/extern/lua https://github.com/replit/jsrepl/tree/master/extern/lua), among others.